Lanzar OPTIXA6B - Manual (Page 11)

FINE TUNE THE SYSTEM
One very important part of fine tuning your system is properly level matching the signal from the
head unit to the OPTIXA6B crossover and from the crossover to the amplifiers. Level matching
is the process of calibrating the audio signal from the head unit all the way to the amplifiers to
eliminate unwanted noise and maximize the dynamic headroom. When the system is properly
adjusted, you should achieve maximum output before distortion at about 3/4 volume on the
head unit.
MATCHING THE SIGNAL LEVEL
1) Turn all amplifiers to min-gain
2) Turn all six channels off via the push button switches.
3) Turn all six level controls to their “max” setting.Yes,”max” as these are attenuators and not
gain or boost potentiometers.
4) Turn the “master” gain control to its minimum setting. This is the main control of the 15-volts
line driver. Use it carefully.
5) Set the head-unit or radio to approximately 3/4 volume.
6) Begin by selecting a channel by turning it “on” and begin raising the amplifier gain until you
reach a desired level of volume.
7) Follow this procedure for all channels that will be used.
8) Raise the “master gain” as desired but try to never pass the 10 O’clock position.
Once all adjustment are made, the system should sound clear without distortion up to 3/4 of
main volume. Also the volume should increase very evenly.
ADJUSTING THE OVERRALL BALANCE OF THE SYSTEM
Once you complete matching the signal level, the following steps ought to be made to set the
overall linearity of the system. This may be necessary due to the relative efficiencies of each of
the speakers. For example, smaller speakers normally are more efficient then woofers and play
louder faster at given equal power (See Figure # 4)The OPTIXA6B’s individual output level
controls allow compensation for this.
It is important to understand that the output levels are not designed to add gain to the
signal.Actually,the output level controls attenuate(reduce signal gain).It is for this reason that in
the following steps we will start with the output levels at the maximum position then reduce the
outputs to balance the system. For example, if you like heavy bass, you will most likely leave
the SUBWOOFER OUTPUT LEVEL at the maximum position and reduce the MID and HIGH
speakers. If you wish to increase the MID and HIGH frequencies, reduce the SUBWOOFER
OUTPUT LEVEL.
(FIGURE # 4)
A VISUAL EXAMPLE OF DIFFERENT OUTPUT LEVELS BASED ON THE SAME POWER
INOUT
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